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1#ifndef __ASM_POWERPC_MMU_CONTEXT_H
2#define __ASM_POWERPC_MMU_CONTEXT_H
3#ifdef __KERNEL__
4
5#ifndef CONFIG_PPC64
6#include <asm-ppc/mmu_context.h>
7#else
8
9#include <linux/kernel.h>
10#include <linux/mm.h>
11#include <asm/mmu.h>
12#include <asm/cputable.h>
13
14/*
15 * Copyright (C) 2001 PPC 64 Team, IBM Corp
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22
23static inline void enter_lazy_tlb(struct mm_struct *mm,
24 struct task_struct *tsk)
25{
26}
27
28/*
29 * The proto-VSID space has 2^35 - 1 segments available for user mappings.
30 * Each segment contains 2^28 bytes. Each context maps 2^44 bytes,
31 * so we can support 2^19-1 contexts (19 == 35 + 28 - 44).
32 */
33#define NO_CONTEXT 0
34#define MAX_CONTEXT ((1UL << 19) - 1)
35
36extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
37extern void destroy_context(struct mm_struct *mm);
38
39extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
40extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
41
42/*
43 * switch_mm is the entry point called from the architecture independent
44 * code in kernel/sched.c
45 */
46static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
47 struct task_struct *tsk)
48{
49 if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
50 cpu_set(smp_processor_id(), next->cpu_vm_mask);
51
52 /* No need to flush userspace segments if the mm doesnt change */
53 if (prev == next)
54 return;
55
56#ifdef CONFIG_ALTIVEC
57 if (cpu_has_feature(CPU_FTR_ALTIVEC))
58 asm volatile ("dssall");
59#endif /* CONFIG_ALTIVEC */
60
61 if (cpu_has_feature(CPU_FTR_SLB))
62 switch_slb(tsk, next);
63 else
64 switch_stab(tsk, next);
65}
66
67#define deactivate_mm(tsk,mm) do { } while (0)
68
69/*
70 * After we have set current->mm to a new value, this activates
71 * the context for the new mm so we see the new mappings.
72 */
73static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
74{
75 unsigned long flags;
76
77 local_irq_save(flags);
78 switch_mm(prev, next, current);
79 local_irq_restore(flags);
80}
81
82#endif /* CONFIG_PPC64 */
83#endif /* __KERNEL__ */
84#endif /* __ASM_POWERPC_MMU_CONTEXT_H */